Closed-circuit television (CCTV) is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. CCTV can be a single network of cameras or multiple networks of camera’s linked together via switches, internet, DVR or wide area computer technology. Once the video data is digital it can be managed just like any other computer data and can be stored automatically on computers and network storage devices.
In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room,for example when the environment is not suitable for humans. CCTV systems may operate continuously or only as required to monitor a particular event. A more advanced form of CCTV, utilizing Digital Video Recorders (DVRs), provides recording for possibly many years, with a variety of quality and performance options and extra features such as motion-detection and email alerts. More recently, decentralized IP-based CCTV cameras, some equipped with megapixel sensors, support recording directly to network-attached storage devices or internal flash for completely stand-alone operation.
The key components of every Closed Circuit Television (CCTV) system are: single or multiple cameras, recording device and a monitor. Closed Circuit Television (CCTV) systems are broadly divided into two known types, namely: wired CCTV systems and wireless CCTV systems. Wired CCTV systems bind all three key components of a CCTV system with cables while a wireless CCTV system comprises of a wireless camera that need not be connected to the recording device and monitor.
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